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Liquid Handling

Raquel Garcia, Elisabete P Carreiro, João P Prates Ramalho, J Mirão, Anthony J Burke, Marco D R Gomes da Silva, Ana Maria Costa Freitas, Maria João Cabrita
Aiming to develop a straightforward magnetic-based sample preparation methodology for the selective extraction of dimethoate from olive oil, the synthesis of dimethoate-imprinted polymer on the surface of modified magnetic nanoparticles has been attempted. Molecular recognition assays have proven their suitability for the selective pre-concentration of dimethoate. Mechanistic basis for template selective recognition has been explored using a quantum chemical approach, providing new insights about the mechanisms underlying template recognition...
July 15, 2018: Food Chemistry
Marilyn C Erickson, Jye-Yin Liao, Mussie Y Habteselassie, Jennifer L Cannon
Field workers often wear gloves harvesting ready-to-eat produce; however, fields are not sterile environments and gloves may become contaminated numerous times during a working shift. This study explored the potential for inactivation of Escherichia coli O157:H7 and Salmonella when contaminated gloves were washed in levulinic acid (LV) and sodium dodecyl sulfate (SDS) solutions. Washing nitrile gloves with increasing concentrations of LV above 1.0% led to a decreased prevalence of glove contamination by Salmonella (P = 0...
August 2018: Food Microbiology
Guang-Wen Lien, Jung-Hsuan Chen, Fang-Wei Tien, Pau-Chung Chen, Huei-Wen Chen, Hsaio-Lin Hwa, Cheng-Chung Fang, Te-I Weng, Pai-Shan Chen
Phthalates are not covalently bound to plastics. They can leach from experimental plastic devices. Due to the development of sensitive techniques, exogenous sources that interfere with the accuracy of phthalate monoester analysis can be easily detected. Here, we propose the simple and rapid dilute-and-shoot method to minimize sample handling and limit contact with laboratory apparatus, which efficiently reduced phthalate interferences mainly from experimental plasticware and improved the accuracy of analysis...
March 3, 2018: Journal of Hazardous Materials
Peng Luan, Sophia Lee, Tia A Arena, Maciej Paluch, Joe Kansopon, Sharon Viajar, Zahira Begum, Nancy Chiang, Gerald Nakamura, Philip E Hass, Athena W Wong, Greg A Lazar, Avinash Gill
To rapidly find "best-in-class" antibody therapeutics, it has become essential to develop high throughput (HTP) processes that allow rapid assessment of antibodies for functional and molecular properties. Consequently, it is critical to have access to sufficient amounts of high quality antibody, to carry out accurate and quantitative characterization. We have developed automated workflows using liquid handling systems to conduct affinity-based purification either in batch or tip column mode. Here, we demonstrate the capability to purify >2000 antibodies per day from microscale (1 mL) cultures...
March 1, 2018: MAbs
Zhizhi Sheng, Honglong Wang, Yongliang Tang, Miao Wang, Lizhi Huang, Lingli Min, Haiqiang Meng, Songyue Chen, Lei Jiang, Xu Hou
The development of membrane technology is central to fields ranging from resource harvesting to medicine, but the existing designs are unable to handle the complex sorting of multiphase substances required for many systems. Especially, the dynamic multiphase transport and separation under a steady-state applied pressure have great benefits for membrane science, but have not been realized at present. Moreover, the incorporation of precisely dynamic control with avoidance of contamination of membranes remains elusive...
February 2018: Science Advances
Evelin Kámán-Tóth, Miklós Pogány, Tamás Dankó, Ágnes Szatmári, Zoltán Bozsó
Agrobacterium tumefaciens is a widely used microbial tool in plant molecular biology to transfer DNA into plant cells and produce, e.g., stable or transient transformants or induce gene silencing. In our study, we present a simplified version of electrocompetent cell preparation that is not only time and cost efficient, but it requires minimal handling of bacterial cells. Liquid cultures are normally used to prepare competent Agrobacterium cells. To overcome the difficulties of working with liquid cultures, we propose suspending bacterial cells directly from overnight agar plate cultures...
March 2018: 3 Biotech
Ellis Whitehead, Fabian Rudolf, Hans-Michael Kaltenbach, Jörg Stelling
Robotic automation in synthetic biology is especially relevant for liquid handling to facilitate complex experiments. However, research tasks that are not highly standardized are still rarely automated in practice. Two main reasons for this are the substantial investments required to translate molecular biological protocols into robot programs, and the fact that the resulting programs are often too specific to be easily re-used and shared. Recent developments of standardized protocols and dedicated programming languages for liquid-handling operations addressed some aspects of ease-of-use and portability of protocols...
February 27, 2018: ACS Synthetic Biology
Jayeesh Bakshi
Radiation exposure is a limiting factor to work in sensitive environments seen in nuclear power and test reactors, medical isotope production facilities, spent fuel handling, etc. The established choice for high radiation shielding is lead (Pb), which is toxic, heavy, and abidance by RoHS. Concrete, leaded (Pb) bricks are used as construction materials in nuclear facilities, vaults, and hot cells for radioisotope production. Existing transparent shielding such as leaded glass provides minimal shielding attenuation in radiotherapy procedures, which in some cases is not sufficient...
April 2018: Health Physics
Attia Anwar, Provvidenza Maria Abruzzo, Sabah Pasha, Kashif Rajpoot, Alessandra Bolotta, Alessandro Ghezzo, Marina Marini, Annio Posar, Paola Visconti, Paul J Thornalley, Naila Rabbani
Background: Clinical chemistry tests for autism spectrum disorder (ASD) are currently unavailable. The aim of this study was to explore the diagnostic utility of proteotoxic biomarkers in plasma and urine, plasma protein glycation, oxidation, and nitration adducts, and related glycated, oxidized, and nitrated amino acids (free adducts), for the clinical diagnosis of ASD. Methods: Thirty-eight children with ASD (29 male, 9 female; age 7.6 ± 2.0 years) and 31 age-matched healthy controls (23 males, 8 females; 8...
2018: Molecular Autism
Andrea Padoan
The successful use of proteomic technology for the discovery of clinically-relevant, new candidate biomarkers, especially in the low molecular weight range (peptidome), calls for a careful consideration of standardized operating procedures (SOP) for pre-analytical variables, including samples handling and storage. The current lack of standardization, widely considered a relevant source of random and systematic errors, underlies the uncertainty of analytical results and poor comparability, especially in multi-centric or inter-laboratory studies...
February 24, 2018: Proteomics. Clinical Applications
Tianyuan Peng, Zachary Wooke, Nicola L B Pohl
Acidic hydrolysis is commonly used as a first step to break down oligo- and polysaccharides into monosaccharide units for structural analysis. While easy to set up and amenable to mass spectrometry detection, acid hydrolysis is not without its drawbacks. For example, ring-destruction side reactions and degradation products, along with difficulties in optimizing conditions from analyte to analyte, greatly limits its broad utility. Herein we report studies on a hydrogen peroxide/CuGGH metallopeptide-based glycosidase mimetic design for a more efficient and controllable carbohydrate hydrolysis...
February 3, 2018: Carbohydrate Research
Martin Winter, Tom Bretschneider, Carola Kleiner, Robert Ries, Jörg P Hehn, Norbert Redemann, Andreas H Luippold, Daniel Bischoff, Frank H Büttner
Label-free, mass spectrometric (MS) detection is an emerging technology in the field of drug discovery. Unbiased deciphering of enzymatic reactions is a proficient advantage over conventional label-based readouts suffering from compound interference and intricate generation of tailored signal mediators. Significant evolvements of matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) MS, as well as associated liquid handling instrumentation, triggered extensive efforts in the drug discovery community to integrate the comprehensive MS readout into the high-throughput screening (HTS) portfolio...
February 1, 2018: SLAS Discovery
Cormac Duffy, Per B Zetterlund, Fawaz Aldabbagh
Cyanoacrylates (CAs) are well-known fast-setting adhesives, which are sold as liquids in the presence of stabilizers. Rapid anionic polymerization on exposure to surface moisture is responsible for instant adhesion. The more difficult, but synthetically more useful radical polymerization is only possible under acidic conditions. Recommendations on the handling of CAs and the resulting polymers are provided herein. In this review article, after a general description of monomer and polymer properties, radical homo- and copolymerization studies are described, along with an overview of nanoparticle preparations...
February 20, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Michel Pugeat, Ingrid Plotton, Aude Brac de la Perrière, Gerald Raverot, Henri Déchaud, Véronique Raverot
Measuring total testosterone level is the first-line approach in assessing androgen excess in women. The main pitfalls in measuring testosterone relate to its low concentration and to the structural similarity between circulating androgens and testosterone, requiring accurate techniques with high specificity and sensitivity. These goals can be achieved by immunoassay using a specific anti-testosterone monoclonal antibody, ideally after an extraction step. Liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS) will be commonly used for measuring testosterone, providing optimal accuracy with a low limit of detection...
February 16, 2018: European Journal of Endocrinology
Katharina Norgren Olsen, Kristine Skoglund Ask, Stig Pedersen-Bjergaard, Astrid Gjelstad
AIM: Liquid-liquid extraction is widely used in therapeutic drug monitoring of antipsychotics, but difficulties in automation of the technique can result in long operational time. In this paper, parallel artificial liquid membrane extraction was used for extraction of serotonin- and serotonin-norepinephrine reuptake inhibitors from human plasma, and an approach to automate the technique was investigated. RESULTS: Eight model analytes were extracted from 125 μl human plasma with recoveries in the range 72-111% (relative standard deviation [RSD] ≤12...
February 16, 2018: Bioanalysis
Joo Shun Tan, Sahar Abbasiliasi, Saeid Kadkhodaei, Yew Joon Tam, Teck-Kim Tang, Yee-Ying Lee, Arbakariya B Ariff
BACKGROUND: Demand for high-throughput bioprocessing has dramatically increased especially in the biopharmaceutical industry because the technologies are of vital importance to process optimization and media development. This can be efficiently boosted by using microtiter plate (MTP) cultivation setup embedded into an automated liquid-handling system. The objective of this study was to establish an automated microscale method for upstream and downstream bioprocessing of α-IFN2b production by recombinant Escherichia coli...
January 4, 2018: BMC Microbiology
Yae Kanai, Hiroshi Nishihara, Yohei Miyagi, Tatsuhiro Tsuruyama, Kenichi Taguchi, Hiroto Katoh, Tomoyo Takeuchi, Masahiro Gotoh, Junko Kuramoto, Eri Arai, Hidenori Ojima, Ayako Shibuya, Teruhiko Yoshida, Toshiaki Akahane, Rika Kasajima, Kei-Ichi Morita, Johji Inazawa, Takeshi Sasaki, Masashi Fukayama, Yoshinao Oda
Genome research using appropriately collected pathological tissue samples is expected to yield breakthroughs in the development of biomarkers and identification of therapeutic targets for diseases such as cancers. In this connection, the Japanese Society of Pathology (JSP) has developed "The JSP Guidelines on the Handling of Pathological Tissue Samples for Genomic Research" based on an abundance of data from empirical analyses of tissue samples collected and stored under various conditions. Tissue samples should be collected from appropriate sites within surgically resected specimens, without disturbing the features on which pathological diagnosis is based, while avoiding bleeding or necrotic foci...
February 2018: Pathology International
Beatriz M Fonseca, Ana C Cristóvão, Gilberto Alves
INTRODUCTION: To comprehend the normal function and pathological characteristics of certain neurological disorders it is important to evaluate the neuroactive amino acids levels in animal models. METHODS: This work describes a simple liquid chromatography-fluorescence detection (LC-FLD) method for the simultaneous determination of aspartic acid (Asp), glutamic acid (Glu), glutamine (Gln), taurine (Tau) and γ-aminobutyric acid (GABA), using methyl-L-arginine as internal standard, in samples of rat brain tissue...
February 6, 2018: Journal of Pharmacological and Toxicological Methods
Yang Jin, Qinyan Yue, Kunlun Yang, Suqing Wu, Shengjie Li, Baoyu Gao, Yuan Gao
A novel cathodic-anodic-electrolysis packing (CAEP) used in the treatment of pyridine wastewater was researched, which mainly consisted of 4,4'-diamino-2,2'-disulfonic acid (DSD acid) industrial iron sludge. The physical properties and morphology of the packing were studied. The CAEP was used in a column reactor during the pretreatment of pyridine wastewater. The influence of pH, hydraulic retention time (HRT), the air-liquid ratio (A/L) and the initial concentration of pyridine were investigated by measuring the removal of total organic carbon (TOC) and pyridine...
January 2018: Journal of Environmental Sciences (China)
Hung-Chang Jau, Pei-Chieh Chou, Chun-Wei Chen, Cheng-Chang Li, Shi-Ee Leng, Chun-Hong Lee, Tsung-Hsien Lin
We report the design, fabrication, and characterization of an optically switchable polarizing beam splitter with a prism/azobenzene liquid crystal/prism hybrid structure. The beam splitter can operate in the polarization-splitting mode and the non-splitting mode. The switching between the modes is realized by the photoisomerization-induced phase transitions in the azobenzene liquid crystal, featuring all-optical control, bistability, and fast response. Such an active polarization-handling element is highly desirable as it not only simplifies and compacts sophisticated optical systems but also increases the degree of freedom in optical circuit design...
January 22, 2018: Optics Express
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